YOL. XL VI, HO. 550 



OCTOBER, 1912 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological 8cience§ \ 

 8pecial Reference to the Factors of Evolution 



THe Diatrlbutlon of Hyla are 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, H. T. 



NEW YORK : SUB-STATION 84 



